Question

find three numbers whose sum is 15 but number should not even only odd numbers

Answer 1

$tn = a + (n - 1)d$
tn=15
a=5
d=5

Answer 2

2n+1+2m+1+2x+1=15
n+m+x=6
Now they can only be 2 so No's. Are 5,5,5